Hakken（CONSEC）

This article reviews the diamond core drills offered by HAKKEN, the manufacturing division of CONSEC. The lineup spans compact lightweight units to heavy-duty large-diameter machines by application. One feature of the units is how they facilitate operational planning, including on-site clutch torque adjustment and dry drilling capability.

• Differences between Hakken（CONSEC）'s flagship core drills and how to choose a drill
• Strengths of the CONSEC core drill for jobs with tight deadlines
• Criteria for selecting core drills, including bits and maintenance support

CONSEC Diamond Core Drill Products

SPZ-253U2i

Source: CONSEC Official Website
(https://www.consec.co.jp/article_source/data/en_product/detail/158.html)

A mid-range Drill Head powered by single-phase 230V with a 2,400W Japanese-made motor. Two-speed no-load speed at 490/1,150 rpm, with drilling capacity up to 254 mm (10"). Equipped with a slipping clutch, One-Touch-Handle, and Swiveling Water Supply Cock. Versatile for tight spaces and Automatic Feeding System retrofits.

Drill Head SPN-203At

Source: CONSEC Official Website
(https://www.consec.co.jp/article_source/data/en_product/detail/162.html)

A mid-range single-speed Drill Head with 110V power, 2,400W maximum output, and a No-load speed of 760 min^-1. The maximum bit diameter is 205 mm (8"), the spindle uses the A-rod thread standard, and the drill head alone weighs 10.8 kg.

It features a slipping clutch that lets users adjust clutch torque on site without disassembling the gearbox. Also, an Automatic Feeding System can be retrofitted using separately sold parts. This drill head is ideal for users who want strong drilling capacity together with on-site adjustability in standard renovation and MEP work.

Drill Head SPF-181Uh2i

Source: CONSEC Official Website
(https://www.consec.co.jp/article_source/data/en_product/detail/116.html)

A lightweight, compact 2-speed unit with 230V power, 2,100W maximum output, and a body weight of 10.2 kg. The no-load speed is switchable between 700 and 1,250 min^-1, the maximum bit diameter is 180 mm, the spindle accepts G1/2 + 1-1/4"-7UNC, and the unit is CE-certified.

The Automatic Feeding System can be mounted without extra parts, and a one-touch pin allows the handle position to be switched between left and right. It is ideal for jobsites where bit diameters change frequently and for cases where users want flexible speed control while prioritizing handling.

Drill Head SPO-400U3w

Source: CONSEC Official Website
(https://www.consec.co.jp/article_source/data/en_product/detail/166.html)

A heavy-duty, 3-speed machine compatible with large-diameter drilling, featuring 120V power and a 3,600W maximum output. The no-load speed is 300/700/950 min^-1, the maximum bit diameter is 406 mm (16"), and one dedicated spacer is required for diameters above 370 mm. The spindle uses the 1-1/4"-7UNC standard, and the drill head alone weighs 16.9 kg.

This drill head is suited to jobs that mid-range machines struggle to handle, including large-diameter through holes for utilities and piping openings.

CONSEC diamond core drills keep schedules moving and
are perfect for tight deadlines and renovation jobsites

CONSEC offers machines with distinct roles, from compact models to heavy-duty large-diameter units. It is a manufacturer that makes operational planning easier through features such as on-site adjustment, parts identification, and dry drilling options. This diamond core drill lineup is well suited for jobsites where multiple bit diameters tend to be used, such as facility retrofits and interior renovation work, as well as for contractors seeking to avoid project delays.

This site features a wide variety of diamond core drills from various manufacturers, in addition to those from CONSEC. Please use this information to find the product that best suits your needs.

Strengths of Hakken（CONSEC）

Source: CONSEC Official Website
(https://www.consec.co.jp/en/)

Designed for on-site adjustability and continuous operation

All three models—the SPN-203At, SPF-181Uh2i, and SPO-400U3w—feature a slipping clutch that allows for on-site clutch torque adjustment without the need to disassemble the gearbox. Even if concrete hardness or mix design varies, the design allows for on-the-spot clutch torque adjustments, facilitating smooth decision-making for a quick recovery to operations.

A dry drilling option that simplifies indoor renovation logistics

CONSEC core drills can be converted to a dry drilling setup by adding a dry-use Swiveling Water Supply Cock, a dry Core Bit, and a commercial dust extractor. This configuration enables water-free drilling while simultaneously vacuuming up dust and debris. By eliminating the need for water containment, slurry disposal, and cleanup—steps essential for wet drilling—operators can often move immediately to the next stage. This significantly enhances efficiency in indoor renovations, occupied-building work, and environments where securing a water supply is challenging.

Hakken（CONSEC） Maintenance & After-Sales Support Network

The CONSEC Official Website provides catalog download and parts list pages. The layout makes it easy to look up documentation and parts information by model. Referring to the website is useful not only for verifying specifications prior to installation, but also for checking parts during operation and organizing information during maintenance.

The Official Website also features a dedicated inquiry form, ensuring streamlined access to expert consultation regarding product specifications and spare parts. The website is carefully designed to help users find the information that they need.

Reviews of CONSEC Diamond Core Drills

The drilling performance exceeded expectations, even on the very first use.

This was my very first time drilling core holes.

I was drilling 65 mm (φ) core holes into a concrete wall. An acquaintance told me that completing 20 holes would be a great outcome, so I even bought a spare bit just in case. I finished all 60 holes in just two days using only the included bit!(Excerpt)

Hakken（CONSEC） Consumables and Bit Information

Bits are easier to select by checking whether you require a dry or wet type, and by whether the bits use C-rod or A-rod thread standards. The following is a list of reference prices in Japan, organized from published standard retail price lists and general catalogs. Overseas specification models may use different thread standards, so compatibility must be confirmed on a case-by-case basis.

About CONSEC

Founded in 1967, CONSEC CORPORATION has expanded its business as a manufacturer of drilling and cutting equipment. In 1976, it established HAKKEN as its manufacturing division. Following an absorption-type merger in 1988, CONSEC established a three-division structure comprising the Manufacturing, Trading, and Construction Divisions.

It obtained ISO 9001 certification at the Hiroshima Plant and other sites in 2000^*, and is currently listed on the Tokyo Stock Exchange Standard Market^* (verified on the official website in March 2026).